Mozilla released an update to its Firefox Web browser Thursday that fixes several security flaws and, as expected, adds support for Macs with Intel processors.

The most serious bugs in Firefox could let an outsider commandeer a vulnerable computer, according to the Burning Edge, a Web site that tracks development of the open-source browser.

The vulnerabilities are fixed in version 1.5.0.2, which was released Thursday. It will be pushed out to users of Firefox 1.5 over the next two days, Mozilla, the company that oversees Firefox development, said on its Web site.